Section 4 (Wiper/Washer Systems - G Series Vans): Overhaul
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1990 GMC Vandura Special, 1990 GMC Vandura, 1990 GMC Rally Camper Special, 1990 GMC Rally, and 1990 GMC Magnavan. However, it is still accessible from the selected car via links, so may be relevant.
Repairs to motor/gear box section of wiper assembly are limited to switch, armature, cap and brush holder assembly, plus external parts, crank arm, spacer and plastic seal, and output shaft seal.